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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7939349e3a2d76d6625c6748cbfa5c01a7d52f92671fe086c2cf3f5df62b072a' 
  AND token = '9oYWeX/n5QOpRgeKOYiyO5fek710ED6LkreZebSbwL0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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