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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4af77d8037df6094ff47b745310f5d2f2e36be6a4f46ac3f3bf5172aec2a69ac' 
  AND token = '6xd3hbyQfDDxmo0+dIERy/r7A5GgO0Sp2hX3b8/wKEs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}