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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59ffc05bf2ed667b99f865c7131ba94db12e8777619239a0a107f27a853d8c7e' 
  AND token = '8sW9+zES17M92+RDIBwIuJ9efY0RDTtdLrl+G9aA8cA=' 
  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"
    }
  }
}