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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a657f70dcec5965794603bd08a2984c939d3c5fc66190c55ac88aef1681cec2' 
  AND token = 'yzphVUt7kogbc4i+YjeGWE76zyEVc2lLLH5VwIIbRn8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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