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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd220b11860da080d5b1b8b92146e0710dda1aebc3c783e3210d77b7aa1200779' 
  AND token = 'T6SctmrIKIY3dO6/3orcILYi27hRrOPEBrbxt/7Yxxc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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