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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '652aad61e1dd52bba376ec0ece9221c3b29d5aabfb06f529d00bd2036ddd4248' 
  AND token = '1lxVdwhx/qyav7pbo3+yrtAXJZ8O/UDBNEwf+9FzC6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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