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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79ab3e97bf612b575462d9ddd92f54572b4ea6a060cb799c9ba27ff0c863df03' 
  AND token = '9+J+K9NBdeZyMc6V5z8jM2y80uQCKkthNlL8wzRSEPo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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