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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0d836fa6e6623314ba7e48867d756a8ef1e9c3b68415d22dc0e985ee6702290' 
  AND token = 'T0GBbYhbM5IQlS3oN2Q/aCOgchYUKO9of4AL66C2evw=' 
  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"
    }
  }
}