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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c39c351361fec06b0af29bf8672b7444eda6edb60fa2c414cbee118b74dfb80f' 
  AND token = 'sFg2l8yUU8A/qOXf57FED+hyy9Cb1fujds52GeWSlic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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