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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4258b9944b6b5777dc1e7ca24d6ad7fe7a28ccc24c120ce75a2c2454e52574e' 
  AND token = '3dNBB2J/TN8vvj1EN7XyV8xkLlJwjACvkfvY727daGg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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