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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af5e5af45625c2a3a3c877f8a8e86a535e412b7233286ffef6ce79752f1f42c3' 
  AND token = 'l0+iS4GrVPvYkZ8Fr6TKza3trC7BdNPjK9XdDC1V6qI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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