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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8db6c92a3dd4c114ad069e87086725d4dcd77c577600fced9166ddcf1d933f6b' 
  AND token = 'YbhsQ6Esj8AnoZCfZpJGEYZ7AZcfADBEajwnEYHCTE4=' 
  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"
    }
  }
}