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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfb260968f021f2c78fed2c4a20968982eabd92a4cca3a0546529134c75c488d' 
  AND token = 'NXTR0Pb8EMGEoUSmBnw2Va6XeFDrVXnX9mrTl7HJp04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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