SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd728659d6f259e60ba7badc0d25d6cba47c875214bfbccc0a78c3847f8eb7118' 
  AND token = 'Nd8KW8jytz4VUuOF+PYv3XfPt/I8HEVdjGZYSKnGE+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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