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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '738706f5a5455b59741f8f38bda2ce937bffb53095c8733d88140758028d0170' 
  AND token = 'R0sHZkb95yi2iwJ7uIQcm+sU8EAB0/3DC+T/PBGAGnY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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