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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '736ab6c0b6d46a8fb7826bb9b9a40b0fa35034513deafefc931ab9f873f5452d' 
  AND token = 'OScJAGbR6H0JKLYOo0jHxrBM5b4AMTPsNNWxzUCJxv4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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