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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3e0889dd7f437514f9824903983db54a42c1c6376681fc7d1fcc00d7bebf062' 
  AND token = 'fvNwnDKu681/Fx9u8jZOodb9Klvoe2xCtHpPxqI8oKs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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