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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83924017b0ef3058da96683e726cbde9243339b6ca9de98e7a5d88a74a808b22' 
  AND token = 'byOk10Unrk0Aw0qmPc5mbdD5DCUj/nt9/NEAi7VcZn4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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