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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a41c4fa3b241a1b4070ccac2e5c8165e8c7aee9538483e3aeb108d5bab791c6' 
  AND token = 'MgGQy0D7vWcwstTN8aKR2nO0q1EB4skIQXOOG7YsoYU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00070

JSON explain

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