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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f2951591896542d74409e25bc5ac890d50e8e6d7dfe1ff4ebf644a5ce3b4b54' 
  AND token = 'cyGD55GMXWYJ3A3C0Q86OQmZVwYAIYz6y171GLMXU/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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