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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b240e750e0255e6963be97c40a167e7b8e96740228045a9d9df32c7a87dde2fb' 
  AND token = 'MI378/YmtGfTG8jWs2+tX4/fdSdrHZpTFq3FznOzuP4=' 
  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"
    }
  }
}