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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b585838d5bf558173bebda4951019ea790a7513f89d3902f5077130fb40cada4' 
  AND token = 'rv5r216bzRiI7RtXUNevFdjN1qExU38v6HEmfbLy4TY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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