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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77bbb9b4f6b1d82c3ff9b0d59ba6f07b9ace2bf477dc08c4ebaade0c70834045' 
  AND token = '1U2bJc0dvXPZGRuTVCbBQWjMhHlC9cET8SYhfYypsnM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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