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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55b37ddca909066d5bf7de77b2ef25ff9ac3fd43ff21b82cd4d26633d14eb452' 
  AND token = '5uKRJO/t4B+tl9pSayCDN1FNx4HgBr66my7kpBGGA9I=' 
  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"
    }
  }
}