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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66a9e504c348603441d70e46b678fdc32bc8d282af098a1dd106472f2697640e' 
  AND token = '98l/8j5SS7qiqk8jcubKqa0iQuGtrnlDiTspFRhmJZQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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