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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a3b80382fee41b6d19c5ae8e457610829ab0a7c912c1929945d7398d37cf463' 
  AND token = 'mysxu45JmmnMIAFTb6tcKE+JUm/4cMM/zE/vJ9oelQA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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