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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47990bfb5c6b836f3bc26c8a438f5a4dc916f765c8cc0b8e125316f787c5e150' 
  AND token = 'Khd/0LQY2vQ7bAhsr/pfxQ6kZOe//ZYra/hR/jEdSrs=' 
  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"
    }
  }
}