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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b38da9d4a3e03aa6a82d683ba29c18c19c29690cee4b8bc25375d4e30c2f115e' 
  AND token = 'Zjy1DMpubNMEmj571hUVgK7FNqg4i7gNzs//B3SdQyk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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