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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eddea11074a8627bb716015e1c1e56af9e69efce4200dde387e1b1d675c15e34' 
  AND token = 'n01G/9vw9c0hIVLSUFOB+JqJ3iLLd824j2du1YBV3ok=' 
  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"
    }
  }
}