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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd30180dccb935e58cd373a87817e671e80abe2d3b2b87afeca890bd59367a52e' 
  AND token = 'DI7rqNt+x5On2z5xs+WwyjqtBBKR4s8zauq8vRTlweo=' 
  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"
    }
  }
}