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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc3187862f00d3c8d2a9543e3b2289562bfaf5a8d0f9eef6763b03717ec14b3b' 
  AND token = '1Rep4e8z52ku8rkVBoFEovD4X/uQZmwJAkCZS5OifYA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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