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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1af13385c2e9e361f367f507c91a0f4e30ea829b8aa7844b1b88666fba2c805' 
  AND token = 'Lf+CrfKIZfQZtNrv4ew8uYEoEaUAm5W0Oan+4SjgvgU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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