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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6dd8c5e9e4e81c8918b28e55b1a78987d1c04b649fe73ee9ff98db131a289163' 
  AND token = '1vLFLtgSrvOVeQ2wzoA73CLbFzGPGecujhiJKrc8SAw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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