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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2f273ac54b204ae56e39f60a0ea9014d19c1ec948111358b4bbfe4e785506d6' 
  AND token = 'dAYOCI/yB1RSgHKRvskRGrMgH4dRqOh3lgDka1M0GYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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