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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb65a8d2feeafbbe715acd484f0bf92f47b2225a96b0e037036cc270e65d8119' 
  AND token = 'WFdIjE4F1eP4iWfdlkqH7Zrk/vgKOs3syYYNuLy2208=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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