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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '501fdd8d2887a5aeb55890a092741a5dc462973a2e5d395a0dc9ef985ccd1843' 
  AND token = 'jaCiKwh+2lbQ31QKrKAHpKJZgUbZrfj9dWo0adfJNg0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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