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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b37183191769b5f684ed6a83bb1db24387b3722f72be0f784f20f84afc80425' 
  AND token = 'IrtStA+gvj6+ZO2LHrARtA5vbIyQmrz5Nj6T7rFAdy4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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