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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '474563c8a9af38968d7f20e488169a975e411abe40ebd6ff6c18af13a6d52c22' 
  AND token = 'Vm/EVH9k6CT+tiHm5BuMPqaUtElcTYEpdT4a3reQovE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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