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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b4ab6070bd280b398839f26e5055eeecd3ff8960c98cbdd0d2bf63214e228b1' 
  AND token = 'u/L7+65DfxPjp9QXXFOXPSp7MomIQExxn44G6fwUd8M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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