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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbe18f1a7ff4b35d8b749a0dcda3f482064113b0ea8a11997a94f5eeb7a68832' 
  AND token = '/MKqHvkBdQ70HIiukXJ0dBcfNMml4JxL00w6N8NrODA=' 
  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"
    }
  }
}