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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14bb17222226065993bf319518b751b9713a6c35e36747f7c1a5d7608153a8b5' 
  AND token = 'eeVjosV6NWyL7nou+p3Y7Vl/bqm+8XXMTt7MKZNIjU8=' 
  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"
    }
  }
}