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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db86d2e1334ca16a237e075b8ac1171b55ed738cba12b5d7ee2c94a29bc1525d' 
  AND token = '0T5XzhnYPsqfw6e+f0tLKqcMpQVhWU42k5HBkqHSVqM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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