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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b1c3e12ebe6877b400b850c5b760bc5794eab152b938cc5f24b11fdff944281' 
  AND token = 'IM9v+Y/02hlL5yQ9TfZ1bnpftyOVSOKyfoE8vzcEBm8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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