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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0fb70083651a27e5d8be7e1c7aa533857f72a3e1b43957c2a3df1e537936307' 
  AND token = '1pZ4Dbp3trlkct070zgRJFiIvH5CcTQMz/hu9FraM7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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