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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5481dcd941f7a145ad2bb1454b39c2fb97380ae4191566a307c205facc8773a' 
  AND token = '1tEXWj32SD9QWVmokswNIDr/nX1zHSY61pox4Pk/+l0=' 
  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"
    }
  }
}