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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c5c4c4b2e88142f771294c52f5728f1e8f31496c7456a6f5c94f9f2010e2955' 
  AND token = 'iqqiuMCZ8S7tsWr49dDOdLuUqQQe13olc8wf2BAeIcU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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