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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '567dd4fe4056d5c3c0ce0cf233d4fccb9250f49c51c3eb80f60538e44501fbfc' 
  AND token = '0F6nsRlRZb1jFg79Ka2Vwf4ioJFK8Hynq8JU+5INGuY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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