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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5a8a54a22aa3dc62555ce3708db32a9a95ea2ace13175c84acfc10f8fd657c5' 
  AND token = '4J8l1GnegcIfXRzaSvCcH55J5C9giSYhW3tdrmtm6rw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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