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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1883accb0a9e0fe3c277d175e52fd9855da1b9f0fb9e025bc2cf26a3e7949506' 
  AND token = '2JVhlwFkMNCBCAseWp2E4vl5NE51Pqyx5av0S81A0fA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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