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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be0aef0cbba9fe2a9f3d2261dcfc9dca84f8ea41a0942f084a2ebe698c941150' 
  AND token = 'eG/YdM83DPsKuyJnjRlDwckx7E6BDIZpSt3al+cAw0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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