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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '194b8bad1cb04dde3fa3870abd335cddba8675196c0dc1fa0047991aa04f0b9d' 
  AND token = 'fdE7f7Rmee0yj6h4H3JeIi653s3A8BupEoqGU5dljcg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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