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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f82c3e86b1ead248a83462960a68fb349846f912f02d751eb8cde0249500249c' 
  AND token = '6gk0EXRH8Gk/0382QH1AeLJVGhVTnwfGD/CQSpIGsf4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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