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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9285edd391e032ac00cd32164bc6a9bfbe993665272fa0f42c1eba55381d4ce' 
  AND token = 'PsElO20UuTnfUjGapM82pbHq2JvNM2ER5aWX67ZZ1jo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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