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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cd13816ae6b5e25a43105d853aa64871bccaa16a0e9e4e747e14c28fdf6301e' 
  AND token = 'j163M4ptQZnpOR4QN+Y4d56ewAtcRD/CqseBunN0Z38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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