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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99ff5fd2d3e1a9251fa1910f1d707496c94518e0f128cfc617e1789e7797e65c' 
  AND token = 'e3986vOGkezEK1FX4Khmg2arNS1ErWpTP9n/dZmowSs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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