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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '952f70d839361b3e591c903b24e2c554a1efc21c050b1cdcb0ee00679c096958' 
  AND token = 'HoDlLnN4HiiAhmcySRJpOiuVROH2PPP7tt3WPALf2fs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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