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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05dd13a8c6b6d57585801b5ee2ec4b16b63804bf6d746d1388737e98fe8ace04' 
  AND token = 'Lh1Qx/WkGHHaX3JobfD+tJaKgRTC6VtI+v+b9uGSsAE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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