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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2594fb648e2ffab1c5990edf0db66ca2dd20374847b7b67c1b166fb3279f530d' 
  AND token = 'yZx35zjLXvN0qe3EWx3kBEUpFMDhHqcpQwlSYasfpSM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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