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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b4288e3389ad19967d270240e4c7d17295dda9b9448a54f3e9f6ee5119b83d3' 
  AND token = 'UaHH+0tdZFYkDvQC5VFNs3OVvFnllDMqOetWprxWfYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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