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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be95f1209b434753e7114aef857e10e2ffc56a0751d528a91e6bb511f0366ef9' 
  AND token = '0vIgWAwyn5XSrCD9pMRzYjZD+xEjMRgoX9rR7KvI8pg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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