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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3222cc743dfdfdb0e3c9626f4c3f78862682ed8540f6b6fd0322cecd62b547a9' 
  AND token = 'hGC83QwP2be1Y+V5FOCYJMDxM+t0NDjL5UcqdOfU/eI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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