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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3333d04fe379dc3335581fb2910554ef6aa9e8630855a365ffacf31dd4760c54' 
  AND token = '4LqjdsnBdsX7G1dDoHm2cRFAQO1RITqZk1QJTEACKjw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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