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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3dc5a6b5b248b82c162fb9033cfb91ef8857e0cd120ecd050fe371c9fd6fa8a' 
  AND token = 'xj+/XYSp/IFZ14I9/ym7U7xueakhuzQgylnEvh8CN9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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